What my customer needs to do in order to install a license after I send my software to him?

With TLL you can send license file or license string (text) to customer, generated by toolbox or the library itself. Customer will need to select file through some dialog (OpenFileDialog) or copy and paste license string. You can choose the preferred way. If you choose to use TLL V2 Easy integration, you can call the Register method from any form you create for your product registration. You can also display registration form designed by us. This process can be optionally automatized using activation server.